AI stock analysis,
explained in plain English
Enter a ticker. Crystal Ball fetches live market data, runs it through Claude AI, and returns a buy/hold/sell recommendation with the full reasoning — in about 30 seconds.
Try it free — analyze any stock →No credit card required · 3 free analyses per day
The 4-step process
You enter a ticker
Type any US-listed stock symbol — AAPL, NVDA, MSFT, whatever you're researching. No account needed for your first look.
We fetch real-time market data
Crystal Ball pulls two layers of data simultaneously:
Price data — live quote, day open/close, 52-week high/low, volume. Sourced from Finnhub (Pro) or Yahoo Finance (free tier) in real time.
Fundamentals — P/E ratio, EPS, revenue growth, profit margin, debt-to-equity, market cap, sector. Gives the AI financial context, not just a price.
Claude AI analyzes the full picture
All the data is handed to Anthropic's Claude AI with a structured prompt. Claude evaluates:
Valuation (is the price justified by fundamentals?), momentum (how is price trending?), risk factors (high debt, declining margins, etc.), and sector context. It weighs these signals against each other — not just pattern-matching on price.
Crucially, Claude must explain its reasoning. It's not allowed to just output a label. The explanation is part of the analysis.
You get the signal + full reasoning
The result isn't just "BUY" or "SELL" — it's a paragraph of reasoning. What drove the signal. What risks exist. What would change the thesis. You decide whether to act.
Where the data comes from
Finnhub (real-time)
Pro users get live price quotes, volume, and intraday data from Finnhub — a professional-grade financial data API used by hedge funds and institutions.
Pro tierYahoo Finance (free tier)
Free users get slightly delayed prices via Yahoo Finance. Same fundamentals, same AI analysis — the difference is a 15-minute price delay on quotes.
Free tierFundamental data
P/E ratio, EPS, revenue, margins, debt levels, and market cap — pulled fresh at analysis time. We don't use stale cached financials.
Both tiersClaude AI (Anthropic)
The analysis engine is Claude, Anthropic's frontier AI model. It's the same model behind Claude.ai — trained on a broad corpus of financial and analytical text.
Analysis engineWhy it's different
Not a black box
Every signal comes with a written explanation. You see exactly what data drove the recommendation and what risks the AI flagged. Other tools show a blinking alert and nothing else.
30 seconds flat
No research rabbit holes. Type a ticker, read the analysis, move on. Crystal Ball does the data gathering and synthesis in the time it takes to open a new tab.
Free to start
3 analyses per day, zero dollars, no credit card. Upgrade to Pro for unlimited analyses + real-time Finnhub prices if you need more firepower.
Common questions
Is this investment advice?
No. Crystal Ball Insights is a research tool that surfaces publicly available financial data and synthesizes it with AI. It's designed to save you research time, not to tell you what to buy. Always do your own due diligence.
How accurate are the signals?
Accuracy depends on your time horizon and market conditions. The AI analyzes the current snapshot of fundamentals and price data — it doesn't predict future events. Use the reasoning to understand what assumptions underlie each signal, then decide if you agree.
Does it work for ETFs, crypto, or international stocks?
Currently optimized for US-listed equities. ETFs with tickers may work partially (price data available, but fundamentals less applicable). Crypto and international stocks are not well-supported yet.
What's the difference between Free and Pro?
Free tier: 3 analyses per day, Yahoo Finance prices (15-min delay). Pro ($29/month): unlimited analyses, real-time Finnhub prices, priority queue. The AI quality and reasoning depth are identical on both tiers.
How is this different from ChatGPT analyzing stocks?
ChatGPT has no live market data — it analyzes based on training data that's months or years old. Crystal Ball fetches real-time prices and current fundamentals at the moment you ask, then feeds that live context to Claude AI. The difference is current data vs. stale training data.
Try it free — analyze any stock in 30 seconds
No credit card. No install. 3 free analyses every day.